A/C vent issue

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Jul 12, 2015 | 11:59 PM

pigpen6214

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Joined: Dec 2012

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A/C vent issue

I recently installed an egr delete and ever since, my vents have been stuck to the upper dash no matter which setting I put the **** on. The vent will push the air conditioning, regular air and heat all the same. I have checked the fuses and they are all good. Any ideas?

Jul 13, 2015 | 12:06 AM

87crewdually

Lead Driver

Joined: Dec 2006

Posts: 6,496

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From: So. Jersey

Check the vacuum line on the passenger side near the HVAC box. Verify there is vacuum present.

Jul 13, 2015 | 07:03 AM

dannyboy950

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Joined: Nov 2012

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I agree when there is no vacum a/c defaults to defrost. Blows only on the windshield.

Jul 15, 2015 | 06:13 PM

Kemicalburns

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Joined: Jul 2002

Posts: 14,285

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From: Bend,OR

interesting, My AC only blows out the front vents. I was surprised it didn't also blow out from under the dash so maybe I have a line disconnected?

Jul 15, 2015 | 06:35 PM

Rusty Axlerod

Lead Driver

Joined: Feb 2011

Posts: 8,241

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From: L.A. (Lower Alabama)

The default position (no vacume applied) is through the defrost vents. You could have no power to the vacume pump, a bad pump, disconnected or leaking vacume lines, or leaking front hubs if your truck has automatic hubs. Step one is to verify the pump is running.

Jul 16, 2015 | 04:20 AM

Danner717

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Joined: Jul 2015

Posts: 79

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From: Shippensburg, PA

I had the same problem. Only when i put it in 4wd it would go to defrost only and back to normal when i took it out. Ended up being the vacuum pump was going bad.